Rotary pump



o. P. WESTIN ROTARY PUMP April 28, 1925. 1,535,275

Filed 23am. 26, 1924 5 Sheets-Sheet. 1

. l VENTOR l? esiizi VV IT'NES BE8 I W 4 v ATTORNEY A ril 28, 1925. 1,535,275

O. P. WESTIN ROTARY PUMP Filed Jan. 26, 1924 3 Sheets-Sheet 2 ATTORN EY April 28,1925. 1,535,275

O. P. WESTIN ROTARY PUMP Filed Jan. 2s 9 4 I 5 Sheets-Sheet. 5

INVENEOR ATTORNEY Patented Apr. 28, 1925..

UNITED STATES OLIVER PETER WESTIN, F FLORENCE, WISCONSIN.

ROTARY PUMP.

Application filed January 26, 1924. Serial No. 688,767.

To all whom, it may concern:

Be it known that I, OLIVER P. WEs'rIN, a citizen of the United States, residing at Florence, in the county of Florence and State of Vifisconsin, have invented a new and useful Rotary Pump, of which the following is a specification.

This invention relates to rotary pumps of the type which comprises a cylindrical casing havin a rotor mounted axially thereof,

and provided with a radially extending blade projecting through a ring, which is mounted eccentrically within the cylinder and divides the latter into two separate compartments.

The general object of the invention is to. increase the efficiency and durability of this type of pumps, by means of various improvements in construction, which embody new principles of operation. These include the elimination of. a reciprocating piston operating through a single cylinder, by the substitution of a radial blade fixed to the rotating shaft, and operating in connection with the eccentrically mounted ring, so that the resultant operation has the effect of two pistonsoperating in two cylinders, and wiping the latter clean at every revolution. The fluid is prevented from leaking between the edges of the radial blade and the walls of the "cylinder by means of twointer locking shoes on the blade. Where the'ra dial blade passes through the eccentric sepa-' rator ring, a roller and pawl in the ring form a seal between the sides of the blade and the ring, while the interlocked shoes on the blade form a seal between the edges of the blade and the ring, thereby preventing leakage to the other. The two compartments of the .cylinder are connected by passageways in such a manner that the fluid passes from one to the other, and the radial blade acts as a valve, so that the fluid cannot travel from one part to the other without revolving the rotor. No air is permitted to enter the cylinders as is possible with the usual plunger pumps.

- The detailed construction of the invention and the principles of its operation will be more fully explained in connection with the accompanying drawings, which illustrate the invention in its preferred form.

In the drawings:

Figure 1 is a plan view of the invention.

of the fluid from one compartment versely of the cylinder substantially on the plane of the line 3-3 of Figure 4.

Figure 4 is a horizontal section taken centrally through the cylinder.

Figure 5 is a plan view of the eccentric separating ring, a portion thereof being broken away.

Figure 6 is an end elevation ofthe upper portion of the separating ring, with a portion thereof shown in section.

Figure '7 is a detail perspective view of the pawl. which. forms a seal for the rotor blade. 1

Figure 8 is a perspective View of the rotor. I

Figure 9 is a view, partly in section and partly in elevation, of the rotor blade.

Figure 10 is a side elevation of the same.

Figure 11 is a perspective view of one of the shoes used in connection with the rotor blade. 1 A

The invention comprises a cylinder 15, which may be of any suitable dimensions, but preferably has an internal diameter greater than its length. This cylinder is integrally or otherwise secured to a suitable movably secured by screws 14 or the like. A shaft 18 is rotatably mounted axially of the cylinder in suitable bushings 19, and may be provided at each end of the cylinder with packing glands 20. The shaft has an enlarged portion 21 fitting between the ends of the cylinder and having a rotor blade 22 secured thereto and extending radially therefrom, and adapted to wipe the walls of the cylinder as the shaft 18 is rotated. The blade 22 extends through a slot 23 in a separator ring 24, which extends longitudinally across the interior ofthe cylinder eccentric thereto, and is seated at each end in a circular channel formed in the end of the cylinder. The diameter and location of the separator ring 24 and channels 25 are such that at one side the ring is internally tangent to the shaft 18, Land at the opposite side is externally tangent to the interior surface of the cylinder 15. The ring, therefore, separates the cylinder 15 into two compartments, one ofwhich is bounded by the interior surface of the ring and the peripheral surface of the enlarged portion 21 of theshaft,

. while the other compartment is bounded by .base 16, and is provided with a head 17 rethe exterior surface of the ring and the interior surface of the cylinder.

The casing of the cylinder is provided with an inlet port 26, which branches out, as shown in Flgures 3 and 4, into two oppositely disposed U-shaped passageways 27, leading through the wall of the cylinder 15 and the head 17 into the inner compartment of the cylinder within the ring 24. Two similar opposed U-shaped passageways 28 lead from the opposite side of the inner compartment, around the ends of the ring in the channels to the outer compartment, from which leads an outlet port 29.

The slot 23, through which the rotor blade 22 projects, extends substantially the length of the cylinder and is bounded on one side by a roller 30, and on the other side by a curved head 31 of a sealing pawl, which has a curved body portion 32 slidably mounted in a correspondlng recess in the ring 24, in the bottom of which is provided a spring 33, which normally forces the head 31 into contact with the blade 22, and in connection with the opposed roller forms a seal between the inner and outer compartments. The ring 24 may be provided with a removable section 34 secured by screws 35, so that the roller 30 and pawl 32 may be easily assembled. (Figure 6.)

The rotor blade 22, as shown in Figures 8 to 11, is provided on three sides with a channel 36 which receives the inwardly extending flanges 37 and 39 of a pair of angular shoes 38, so that the shoes are extending both radially and axially, and are interlocked by the engagement of the inwardly extending flange 39 of each shoe with a cooperating slot 40 in the other shoe. A bore 41 is formed through the rotor blade 22 parallel to the shaft 18, and receives an expansible coiled spring 42, which cooperates With the circular heads 43 to urge the shoes 38 outwardly, and thus form a seal against the walls of the cylinder. (Figures 2 and In the operation of my invention, when the shaft 18 is rotated in the direction of the arrow a from the positionshown in full lines in Figur 3, the fluid is drawn in by suction throu h the inlet port 26 and the passageways 2 into the inner compartment within the separating ring 24 behind the rotor blade 22, while the fluid contained within the ring 24, in advance of the rotor blade, is forcibly expelled through the passageways 28 into the outer compartment, and thence through the outlet port 29. As the rotor blade approaches the position shown in broken lines in Figure 3, the greater portion of its force is exerted on the fluid in the outer compartment to expel the fluid therefrom, while the incoming fluid is drawn by suction through the passage ways 28 from the inner compartment to the outer compartment behind the rotor blade compartment.

As the rotor blade passes the inner parts of the inlet passageways 27, the expulsion of the fluid originally contained in the outer compartment has been practically completed, and the rotor blade, as it completes its revolution, is drawn within the inner compartment, behind the fluid Which has been drawn into the inner and outer compartments, respectively; It is understood, of course, that the separating ring 24 rotates u on its own axis within the channels 25, wlnle the rotor blade is revolved about the axis of the shaft 18.

After the blade 22 in its rotation passes the ends of the passageways 28, there will still be a small quantity of fluid confined within the small cusp in the inner compartment below said passageways, and in order to'permit this to escape small grooves 44 lea-d from the inlet ends of the passageways 28 to the lowermost point of the inner Likewise, small grooves 45 are formed below the outlet ends of the passageways 27 for permitting a small amount of fluid to enter behind theblad-e 22, before the latter reaches the passageways 27.

From the foregoing description, it will be understood that from each revolution of the rotor, a volume of fluid equal to the entire contents of the cylinder 15 will be expelled through the outlet port 29, while a like volume of fluid will be drawn into the cylinder through the inlet port 26. The shoes 38, together with the roller 30 and pawl 28, which hug the opposite faces of the rotor blade form an effective seal to prevent any leakage of fluid past the rotor blade, or between the inner and outer compartments of the cylinder. No air is allowed to enter the cylinder at any .point of the operation. The pump is therefore positive in its operation, and the maximum amount of fluid is pumped for the amount of energy ex pended.

While I have shown and described the various details of construction which at present represent the preferred form of the invention, it is to be understood that various modifications may be, made therein, as well as in the arrangement of the various parts without'departingfrom the salient features .of the invention,'or sacrificing any of the advantages thereof,

What is claimed is:

1. A rotary pump comprising a cylinder having interior eccentric circular channels in the ends thereof, a cylindrical separating ring seated in said channels and separating the cylinder into two compartments, said ring having an elongated slot extending from end toend of the cylinder, a rotor mounted axially of the cylinder and having a blade extending through said slot and in wiping contact with the side and ends of the cylinder, an inlet port to one compartment and an outlet port to the other compartment, and a passage connecting the two compartments.

2. A rotary pump comprising a cylinder having interior eccentric circular channels in the ends'thereof, a cylindrical separating ring seated in said channels and separating the cylinder into an inner and an outer compartment, said ring having an elongated slot extending from end to end of the cyl inder, a shaft mounted axially of the cylinder and having a rotor blade extending through said slot and in wiping contact with the side and ends of the cylinder, yieldable means for forming a seal around the blade where it extends through the slot so as to prevent leakage between the compartments, an inletport to one compartment, an outlet port to the other compartment, and a passage through the end wall of the cylinder connecting the two compartments.

3. A rotary pump comprising a cylinder having interior eccentric circular channels in the ends thereof, a separating ring seated in said channels and separating the cylinder into an inner compartment and an outer compartment, said ring having an elongated slot extending from end to end of the cylinder, a shaft mounted axially of the cylinder and having a rotor blade extending through said slot, said blade having a peripheral channel with shoes mounted therein, ,yielda-ble means urging said shoes outwardly to form a wiplng contact with the side and'ends of the cylinder and with the ends of the slot, yieldable means for forming a seal between the sides of the blade and the sides of the slot so as to prevent leakage between the compartments, an inlet port to one compartment, an outlet port to the other compartment, and a passageway connecting the two compartments.

.4. A rotary pump comprising a cylinder having inlet and outlet ports, a rotor mounted axiallyof the cylinder and having a radi ally extending blade with channels formed in its edges, shoes mounted in said channels, yieldable means urging said shoes outwardly to form a wiping contact with the sides and ends of the cylinder, a cylindrical ring eccentrically mounted within the cylinder and separating the same into two compartments which are in communication with the respective ports, said ring being tangent internally to the rotor and revoluble about its own axis and having a slot through which the blade projects, and a passageway connecting the two compartments.

5.'A rotary pump comprising a cylinder having inlet and outlet ports, a rotor mounted axially of the c linder and having a radially extended bla e with channels formed in three sides, a radially extending shoe, and a means mounted in the blade to urge theshoes outwardly and thus form a seal against the walls of the cylinder.

6. A rotary pump comprising a cylinder having interior circular channels in the ends thereof, a separating ring seated in said channels and separating the cylinder into two compartments, said ring having an elongated slo-t extending from end to end of the cylinder, a shaft mounted axially of the cylinder and having a rotor blade extending through said slot, a roller mounted in the ring at one side of the slot and adapted to form a sealing contact with one face of the blade, a round headed pawl slidably connected to the blade at the other side of the slot and extending laterally from end to end of the cylinder, and means for urging the head into sealing contact with the face of the blade opposite the roller.

7. A rotary pump comprising a cylinder having interior eccentric circular channels in the ends thereof, a separating ring seated in said channels and separating the cylinder into two compartments, said ring having an elongated slot extending from end to end of the cylinder, a shaft mounted axially of the cylinderand having a rotor blade extending through said slot, a roller mounted in the ring at one side of the slot and adapted to.

form a sealing contact with one face of the Cal blade, a pawl slidably connected to the ring at the other side of the slot and extending laterally from end to end of the cylinder, yieldable means for urging the pawl into sealing contact with the face of the blade opposite the roller, an inlet port to one compartment, an outlet port to the other compartment, and a passage connecting the two compartments.

8. A rotary pump comprising acylinder having interior eccentric circular channels in the ends thereof, a cylindrical separating ring seated at its edges in said channels and dividing the cylinder into an inner and an outer compartment, said ring having an elongated slot extending from end to end of the cylinder, a shaft mounted axially of the cylinder and having an enlarged portion of the ring to the outer com artment, and

an outlet port leading from t e outer com- 'partment through the cylinder. A 9. A rotary pump comprising a cylinder terior of said ring being tangent to the shaft and the exterior of the ring at the opposite side being tangent to the interior of the cylinder, inlet passages leading to one side of the inner compartment substantially midway between the lines of tangency, passageways leading from the opposite side of the inner compartment to the outer compartment, and an outlet for the outer compartment.

10. A rotary pump comprising a cylinder having interior eccentric .circular channels in the end thereof, a cylindrical separating ring seated in said channels and separatin the cylinder into an inner compartment and an outer compartment, said ring having an elongated slot extending from end to end of the cylinder, a shaft mounted axially of the cylinder and having a rotor blade extending through said slot and in wiping contact with the side and ends of the cylinder, the interior of said ring being tangent to the shaft and the exterior of the ring at the opposite side being tangent to the interior o the cylinder, inlet passages leadingto one side of the inner com artment substantially midway between the ines of tangency, passageways leading from the opposite side of the inner compartment to the outer coinpartment, and small grooves in the sides of the cusp portions of the inner compartment and connected to the respective passages to permit the fluid to enter and escape from the respective cusp portions.

11. A rotary pump comprising a cylinder having interior eccentric circular channels in the ends thereof, a cylindrical separating ring seated in said channels and separating the cylinder into an inner compartment and an outer compartment,said ring having an elongated slot extending from end to end of' the cylinder, a shaft mounted axially of the cylinder and having a rotor blade extending through said slot into wiping contact with the side and ends of the cylinder, yieldable means for forming a seal around the blade where it extends through the slot so as to prevent leakage between the two compartments, the interior of said ring being tangent to the shaft and the exterior of the ring at the opposite side being tangent to the interior of the cylinder, inlet passages leading to one side of the inner compartment substantially midway between the lines of tangency, passageways leading from the opposite side of the inner compartment to the outer compartment, and small grooves in the sides of the cusp portions of the inner compartment and connected to the respective passages to permit the fluid to enter and escape from the respective cusp portions.

In testimony that. I claim the foregoing as my own, I have hereto aflixcdmy signature.

OLIVER PETER WESTIN. 

